John diederich muller



(No Model.)

J'. in. MULLER.- SGRBW; .PR0PELLER- Patentfd Oct. 24, 1893.4'

ha Arm/MEV UNITED STATES PATENT OFFICE.

JOHN DIEDERIOH MULLER, OF NEW YORK, N. Y.

SCREW-PROPELLER.

SPECIFICATION forming part of Letters Patent No. 507,502, dated October24, 1893.

Application ledDecember 2. 1892. Renewed Gctober 3, 1898. Serial No.487.109. (No model.)

To all whom it may concern:

Be it known that I, JOHN DIEDERICH MUL- LER, a citizen of the UnitedStates, residing at New York, in the county and State of New York, haveinvented new and useful Improvements in Propellers, of which thefollowing is a specilication.

This invention relates to propellers and consists in certain novelfeatures of construction described below, reference being had to theaccompanying drawings, in which- Figure l, is an end view of mypropeller, looking in the direction of the arrow in Fig. 2. Fig. 2, is acentral section on the line .'10 a: of Fig. l. Fig. 3, is thereinforcing plate detached.

The letters A, A, A, A, designate the blades of a propeller for vesselsor boats. They are preferably made from a single piece of metal and aretwisted into the proper helical shape after they are cut out and aremade with a central opening to receive the shaft of the propeller,corresponding with the central opening E of the radial plate hereinafterdescribed. In the case however of propellers of large size the severalblades can be made separately and united to each other at their necks orinner ends where their coming together unites them into a central web Baround the hub C. The hub O is made hollow so as to receive a shaftwhich may be keyed to the hub or secured to itin any other suitablemanner.

The several blades are reinforced and strengthened by a radial plate Emade preferably from a single piece of metal, and provided at its centerwith an opening E that receives in it the shaft. The arms of said plateextend on the outer side of the bladesA about half way to their ends,and are bolted or riveted to them by bolts G.

The central parts or webs of the blades and of the radial plate aresecured to each other and to the hub O by conical flanges H, H, whichencircle the two sections or parts of the hub on opposite sides of theblades and which are bolted to each other and to the radial plate E, by`bolts I. The fianges are conical in thelr exterior shape, so that theymay have great strength and be the better able to support the hub Oaround which they are placed, and to connect the hub to the blades ofthe propeller and to the radial arms of plate E. This construction ofthe flanges H H enables me to till up the angular depressions whichotherwlse would be formed around both sides of the hub and between itand the faces of the propeller blades. The hub C is by the constructlonshown and described practically made in two parts which are separatedfrom each other by the central portions or webs of the propeller bladesand the reinforcing radial plate E and are then united and held to eachother by the bolts, I, which are required, as in the case of the otherparts also, to be of great strength and resisting power.

It will be observed that the propeller blades are radial and that theirends are free so that they can not easily be obstructed by rubbish orwreckage and will be able to clear themselves from such obstructions.

What I claim as new, and desire to secure by Letters Patent, is-

A propeller, consisting of the blades A united together at the center, ahub composed of two sections each having a conical flange H, a radialplate Eformed independent of and bolted to the blades and arrangedbetween the two sections of the hub, and the bolts I extending throughthe conical flanges of the hub sections and through the radial plate andblades, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JOHN DIEDERICH MULLER.

Witnesses:

J. VAN SANTvooRD, E. F. KASTENHUBER.

